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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by schmitt trigger

  1. S

    EASYEDA simulation interpterion?

    In addition to what Danadak mentioned, The LM358's inputs should be biased mid-supply if you would like to amplify the negative portion of a sinewave.
  2. S

    Wow – Do You See The Problem?

    Reminds me of this poor cat. And no, I don’t have facebook. https://www.facebook.com/share/r/1BxjzqM27D/
  3. S

    Will this work for building a bench supply ?

    Years ago, 1983, I built such a system to charge a UPS battery bank, 48 lead-acid cells. With an equalization voltage that would require 112 volts @ 30 amps. Back then, SCRs were the only way to achieve that much power. But nowadays IGBTs would be the semiconductor of choice. Operated as a...
  4. S

    Low Cost US PCB Manufacturers

    I also stained my mom’s laundry tub with ferric chloride. But weren’t the stains a dark brown? It would drive my mom crazy. The blue stains were caused by ammonium persulphate, but it has been so long ago, late 1970s, that I could be wrong.
  5. S

    This DC submersible motor safe?

    An interesting question would be: “how come did it crack in the first place?” If it had an impact or was it crushed I could understand it. But if it was caused by chemical degradation of the plastic body, that could be a sign that it will continue to disintegrate. Many years ago I purchased a...
  6. S

    what happen to Pommie

    Similarly, what happened to Audio Guru? Last seen March 2025.
  7. S

    Raise your hand if your car had one of these:

    Indeed. And it was either free or you had paid for it. Once and only once. No slowly bleeding you to death with subscriptions.
  8. S

    Raise your hand if your car had one of these:

    When one didn’t have to have a subscription to listen to music. Even though it was lo-fi, static ridden AM.
  9. S

    Impact of Tariffs on PCB Fab

    Count me as someone else who also wants to know the value of that quote.
  10. S

    Anyone jumped from Easyeda std to Easyeda pro?

    Yes! I also use Ibom.
  11. S

    Anyone jumped from Easyeda std to Easyeda pro?

    This is a specialized but very powerful feature. Another good feature that I also noticed is that when you open a project with a multi-page schematic, the pages appear hierarchically. But there is a big downside for me: while there is a utility you can use to import Standard projects into...
  12. S

    Anyone jumped from Easyeda std to Easyeda pro?

    Anyone has jumped from EasyEDA std to EasyEda pro? I have attempted it, twice. But, and call me a Luddite, I don't like it. My main gripe is that many of the keyboard shortcuts which by now are firmly ingrained into muscle memory, are now different. For instance, to rotate a component, I know...
  13. S

    Impact of Tariffs on PCB Fab

    Weeeell...If one plans to use ExpressPCB, based in Oregon AFAIK, which I used for many, many years until I discovered Chinese vendors. As an exercise, a few minutes ago I re-quoted a board that I had done many years ago. Nothing fancy 2-sided, 1-Oz copper, 67 X 95 mm, HASL, Silkscreen only on...
  14. S

    Current sources in parallel...

    By superposition, yes, all the parallel currents add up. As long as the voltage compliance of the source with the narrowest range is not exceeded. EDIT: I actually did an experiment with a pair of JFETs. As long as the supply voltage was high enough to operate both devices in saturation, the...
  15. S

    3½ Glorious Nixie Tube Digits!

    That was about the time I was guessing. In the mid-1970s I saw a brand new Keithley DMM which it still had Nixies.
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